(This concerns the general type of situation SCP-0000 should be held in. The specifics of SCP-0000’s current arrangement can be found in Addendum 0000-01-SE.CARIBBEAN.)

This breaks the format of containment procedures; I expect it to pay off. Otherwise, I'd take it out — what you're saying here is part of the contrivance of SCPs, and doesn't need to be made explicit.

It is essential that this document is not to be shown to any representative of the United Nations or any governmental organization under any circumstances.

This could be much tighter:

This document is not to be shown to any representative of a governmental organization.

Any area for SCP-0000’s containment must have a multitude of island micro nations in close vicinity of each other, with around 4 - 5 countries selected to be involved in the 'program'.

Could be significantly tighter:

SCP-0000 must be contained on one of at least four multiple island micro-nations all within close vicinity of one another.

An area of Foundation ownership is to be established on every island, officially under the ownership of some sort of cover organization.

"some sort of cover organization" breaks formal tone. I'd also consider "A Foundation-owned region is to be established on every island".

These acts are not merely options, but strict responsibilities, to be carried out in a manner that they are fundamentally impossible to trace back to the Foundation.

Why are you making this explicit? Containment procedures are about what we must do, not what we can do; you don't need to clarify that these aren't options.

“That last part was initially added because nobody thought it would ever come to that. Now we’re fucked, because the nightmare is real and we have no options.” -Doctor ██████

This is pretty close to 'lolfoundation', and not in that fun tongue-in-cheek way.

SCP-0000 is a 10 cm rose stem. It acts as a sort of timer; it loses all of its petals over a 23 hour period and grows them back over the course of the next hour, in a process shown to be impossible to halt.

'sort of timer' is informal, and you can make this much tighter:

SCP-0000 is a 10 cm rose stem. It sheds its petals over a period of 23 hours, only to grow them back over the course of an hour.

You don't need to tell us it can't be halted, or that it acts as a timer; we get these things implicitly.

When SCP-0000 loses its final petal, it ‘activates’, and the nation it is in becomes an instance of SCP-0000-1.

You can make this tighter:

When SCP-0000 sheds its final petal, the nation it is in becomes an instance of SCP-000-1.

Any nation designated SCP-0000-1 will either be annexed by a foreign power, descend into violent revolution, or rendered uninhabitable, before a maximum period of two (2) years.

Always try to put the most important part of your sentence near the end (when possible). Also, tightening:

Within two years, SCP-0000-1 will either be annexed, descend into a violent revolution, or otherwise be rendered uninhabitable.

This process is practically impossible to stop, as SCP-0000 has thus far proven itself to be capable of changing any and all factors or events according to these goals; it is potentially omnipotent.

'potentially omnipotent' breaks tone. Tightening:

All Foundation attempts to avert this have, thus far, failed.

I'm going to stop here with the whole tightening schtick; I think you get the idea. You can cut a lot of this down and make it significantly meaner and leaner. It'll probably help make what's going on much more clear, too. And remember to maintain formal tone whenever you can!

So, it's a rose that, upon losing its petals, results in the nation holding it experiencing a horrible catastrophe. Furthermore, any world leader who hears about it is compelled to obtain it. It's basically a 'cursed' Spear of Destiny.

I like the containment procedures you're using to contain it (though I think that they could use some heavy restructuring). The idea of the Foundation having to ensure this thing gets passed from nation to nation to prevent it from 'escaping' is a good one. The idea of these nations all making peace — resulting in it breaching containment — is also neat. I liked the interview, though I think 'wonderful tortures' was pushing it a little.

Here are some problems:

The rose loses all its petals within 23 hours, then regrows them. This repeats. You never clarify if this continues to occur even after it's been activated (it's implied that it does). This seems needlessly confusing and complicated; the presence of the timer effect itself is irrelevant to the nature of the anomaly (it's passing hands from country to country that's important, here). I'd suggest finding a way to cut the timer aspect (maybe it wilts as the country collapses, and grows its 'petals' back once it arrives/is taken into a new country?).

The compulsion effect feels forced, here. It's clear you're using it to justify how the thing ends up in country after country. I think the skip would benefit from junking it and finding a more creative method of allowing it to spread. Alternatively, have the compulsion effect, but never make it explicit; the Foundation doesn't know why countries keep trying to take the rose (maybe it just happens when one country annexes another — someone ends up taking it during an attack or raid, or something).

The PoI feeling 'guilty' seems a little silly and unnecessary; the Foundation would probably just mention that they immediately turned it over (not that they felt 'guilty' about it).

Similarly, you characterize the rose several times (mentioning it seems to be 'impatient', its 'seeming omnipotence', etc). I think this is a misstep.

I think the strongest parts of this piece are the way the Foundation is dealing with the anomaly and the manner in which it crumbles apart; I think there are some alternative directions you could go here for your wham-line, too.

All in all, I think the piece has potential! But I highly doubt it would survive on mainlist in its current form. Your prose is relatively strong (it could be a lot tighter and a little more clean, but you've got good grammar), the concept is interesting, but it feels a bit mushy right now. I think this idea needs to spend a bit more time in the oven before it's ready to roll out.

One more thing: You do the number (number) thing a lot (eg: "two (2) years"). That's no longer a site-standard in articles; you might want to avoid it.

Hello! I followed your advice, and made the entire article cleaner and more concise! (While I think the description and containment procedures are good now, I still need to figure how to make everything after that have better order.) I changed the line that clarifies the actions are mandatory, although I replaced it with a quick justification to the containment procedures. If you believe this is still an issue, I can remove it. I also clarified that the rose's process repeats. To work around the memetic effects being coincidently inconvenient, I tried to imply that the creator was more malicious in attempting to make something that covered its options (I did not remove it, I merely went through a process to make it less ridiculous). I also depersonalized the artifact and fixed the number thing.